.rubocop.min.yml

Style/SpaceAroundOperators:
  Enabled: false
Style/BlockDelimiters:
  Enabled: false

.rubocop.yml

inherit_from:
  - .rubocop_todo.yml

.rubocop_todo.yml

# This configuration was generated by `rubocop --auto-gen-config`
# on 2015-07-24 12:18:10 +0900 using RuboCop version 0.32.1.
# The point is for the user to remove these configuration records
# one by one as the offenses are removed from the code base.
# Note that changes in the inspected code, or installation of new
# versions of RuboCop, may require this file to be generated again.

# Offense count: 1
# Cop supports --auto-correct.
# Configuration parameters: EnforcedStyle, SupportedStyles, ProceduralMethods, FunctionalMethods, IgnoredMethods.
Style/BlockDelimiters:
  Enabled: false

# Offense count: 1
# Cop supports --auto-correct.
# Configuration parameters: MultiSpaceAllowedForOperators.
Style/SpaceAroundOperators:
  Enabled: false

auto-gen.sh

$ bundle exec rubocop --auto-gen-config

Inspecting 1 file
C

Offenses:

first.rb:1:21: C: Prefer {...} over do...end for single-line blocks.
[1, 2, 3, 4, 5].map do |i| puts i ** i end
                    ^^
first.rb:1:35: C: Space around operator ** detected.
[1, 2, 3, 4, 5].map do |i| puts i ** i end
                                  ^^

1 file inspected, 2 offenses detected
Created .rubocop_todo.yml.
Run `rubocop --config .rubocop_todo.yml`, or
add inherit_from: .rubocop_todo.yml in a .rubocop.yml file.

cat-rubocop.yml.sh

$ cat first.rb
[1, 2, 3, 4, 5].map do |i| puts i ** i end

$ cat > .rubocop.yml
Style/SpaceAroundOperators:
  Enabled: false
Style/BlockDelimiters:
  Enabled: false
^C

$ bundle exec rubocop first.rb
Inspecting 1 file
.

1 file inspected, no offenses detected

first-1.sh

first.rb:1:21: C: Prefer {...} over do...end for single-line blocks.
[1, 2, 3, 4, 5].map do |i| puts i ** i end
                    ^^

first-2.sh

first.rb:1:35: C: Space around operator ** detected.
[1, 2, 3, 4, 5].map do |i| puts i ** i end
                                  ^^

first.rb

[1, 2, 3, 4, 5].map do |i| puts i ** i end

first.sh

$ ruby first.rb
1
4
27
256
3125

$ bundle exec rubocop first.rb 
Inspecting 1 file
C

Offenses:

first.rb:1:21: C: Prefer {...} over do...end for single-line blocks.
[1, 2, 3, 4, 5].map do |i| puts i ** i end
                    ^^
first.rb:1:35: C: Space around operator ** detected.
[1, 2, 3, 4, 5].map do |i| puts i ** i end
                                  ^^

1 file inspected, 2 offenses detected

first_fixed.rb

[1, 2, 3, 4, 5].map { |i| puts i**i }

first_fixed.sh

$ bundle exec rubocop first_fixed.rb
Inspecting 1 file
.

1 file inspected, no offenses detected

Gemfile

source 'https://rubygems.org'

gem 'rubocop'